Input wanted on a ladder test

I did a ladder test with my 6.5 x 55 using the 130 Accubond and RL 22 in WW cases with 210M primers. The rifle began as a Ruger 77 but now wears a Schneider barrel and a Brown stock. This rifle is a sub 3/4 MOA shooter (sometimes WAY sub). The test was fired at 200 yards. The ladder started with 47.3 gr RL 22 and went up in 0.3 gr increments to 50.0. 50.0 is pretty clearly max. The bullets hit in a clockwise pattern until I reached shots 8, 9 and 10. I am thinking that is the node. What do you think? Here is a picture of the target.

Yes, there is some info there, but I am just not seeing the distinct pattern.

There is such a wide variation for a 200 yard group, that something else may be happening here. 2 1/2" verticle dispersin between shots 1/2/3.

4/5/6 only 1" verticle, but 2" horizontal.

#7 is up in the north 40 with #3.

8/9/10 are 1.2"ish x 1.2" ish as well.

Did you run these over a chronograph as well? Would be interested in seeing the numbers there.

On another note, not every barrel likes accubonds for some reason. Some will shoot half MOA, others in the 2 MOA range - but either will hold the same across distance. Weight sort and bearing length sort the bullets by chance?

I can't speak for Mikecr. But as acloco pointed out, 4-5-6 might be a node and 8-9-10 might be a node. But, it's really hard to say for sure when you're dealing with small samples.

And, it's not clear what role if any the wind or general accuracy played.

I like to stick orange dots on my target to give me several aim points and shoot 2 or perhaps 3 shots at each dot for each powder level and then compare the tightness of each group as well as the relative POI.